Golang Gin 中间件 Next()方法示例详解

// 日志中间件
func MiddleWareLog() gin.HandlerFunc {
	//这里也是context，因为你的中间件也是对请求和响应的处理，只要涉及到请求和响应的处理就用到context上下文
	return func(c *gin.Context) {
		fmt.Println("log start")
		c.Next()
		fmt.Println("log end")
	}
}
 
func MiddleWareRequestId() gin.HandlerFunc {
	return func(c *gin.Context) {
		fmt.Println("request id start")
		c.Next()
		fmt.Println("request id end")
	}
}
func main() {
	r := gin.Default()
	r.Use(MiddleWareLog(), MiddleWareRequestId())
	r.GET("/", func(c *gin.Context) {
		fmt.Println("app handler.......")
		c.JSON(http.StatusOK, gin.H{
			"msg": "success",
		})
	})
	r.Run(":8000")
}

[GIN-debug] Listening and serving HTTP on :8000
log start
request id start
app handler.......
request id end
log end
[GIN] 2023/04/08 - 09:51:03 | 200 |      2.2505ms |             ::1 | GET      "/"

package main
 
import (
	"fmt"
	"github.com/gin-gonic/gin"
	"net/http"
)
 
func AuthMiddleWare() gin.HandlerFunc {
	return func(c *gin.Context) {
		//常用场景，客户端也就是接口的调用方，客户端携带token的方式 1:请求头(最常用) 2:请求体 3:uri
		token := c.Request.Header.Get("token")
		fmt.Println("获取token信息:", token)
 
		if token != "qazw1234" {
			c.JSON(http.StatusOK, gin.H{
				"msg": "身份验证不通过",
			})
			//Abort方法用于跳到handler链表最后一个index，相当于直接退出，不执行后面的handler了
			c.Abort()
            return
		}
	}
}
 
func main() {
	r := gin.Default()
	r.GET("/home", AuthMiddleWare(), func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			"msg": "home路由",
		})
	})
	r.Run(":8000")
}